From: David Kaiser (firstname.lastname@example.org)
Date: Mon Nov 27 2000 - 16:28:12 PST
Nope. This is conjecture based on my expectations and experience. But when I
confronted a support person at Avanti, he addmitted that there may be
limitations above 1GHz.
From: Larry Miller [mailto:email@example.com]
Sent: Monday, November 27, 2000 11:53 AM
To: David Kaiser; Kai Keskinen; firstname.lastname@example.org
Subject: RE: [SI-LIST] : Accuracy of HSPICE W-element transmission lines
Yes, but have you compared your results (either) with real hardware?
Inquiring minds want to know....
From: David Kaiser [SMTP:email@example.com]
Sent: Monday, November 27, 2000 10:17 AM
To: Keskinen, Kai [KAN:0G15:EXCH]; firstname.lastname@example.org
Subject: RE: [SI-LIST] : Accuracy of HSPICE W-element transmission
I have compared the W-element with the RLGC matrix from running
APSIM on 100 Ohm diff'l pairs). With a 30ps pulse and 10ps rise times, the
reflected pulse was very symetrical for the W-element, but showed and RC
roll off with APSIM. The APSIM seemed to shown a more realistic reflection
310 Interlocken Pkwy.
Broomfield, CO 80021
From: Kai Keskinen [ mailto:email@example.com
Sent: Thursday, November 23, 2000 11:19 AM
Subject: [SI-LIST] : Accuracy of HSPICE W-element transmission lines
We have now several times encountered differences in results from
other modelling packages and results from HSPICE w-element models for
applications involving fairly long striplines > 30cm on FR4 and GETEK with
2.5Gbps signals with ~100ps edge rates. The W-element model appears to give
lower loss than the other techniques. Typical track widths are 6-8 mils with
100Ohm loosely coupled differential pairs.
Avant! claims the W-element method is accurate without providing a
paper showing how it was validated.
How does the rest of the SI community feel about the accuracy of the
Thanks in advance,
Equipment and Network Interconnect
Nortel Subsystems and Performance Networks (NSPaN)
(613)-765-3506 (ESN 395)
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